Circular Saw Jig
A few variations on the same basic approach. I have parts to make the first one.
https://www.youtube.com/watch?app=desktop&v=dfw3kagja2E + https://www.mistrymaketool.com/how-to-make-circular-saw-crosscut-jig/
https://www.youtube.com/watch?app=desktop&v=-WzbmiLAcH4
https://www.thedailygardener.com/homemade-circular-saw-jig-plans
